AI Face Swap for Videos Explained
AI face swap for videos is not a Flixly feature, but this guide explains how face replacement works, the consent risks, and the Flixly tools that cover similar goals.
TL;DR
AI face swap for videos is not available on Flixly. Face-replacement software maps one person's face onto another across an existing clip and raises serious consent issues. On Flixly you can instead generate new clips of a subject you have rights to with Reference to Video (Seedance 2.0, Veo 3.1, Wan 2.7), animate a character with Motion Control, and match mouth movement to new audio with Lip Sync. Cost is quoted before each generation.
What face replacement in video actually does
AI face swap for videos is not something Flixly offers, but the technique is worth understanding. Dedicated face-replacement software maps a target person's face onto someone else across every frame of an existing clip while keeping body movement, background and audio. It edits footage rather than creating new scenes.
How face-replacement models process frames
These tools detect the face in each frame, track landmarks such as eyes, mouth and jaw, map the new identity onto them, and blend skin tone and lighting. Weak spots show up on fast head turns, profile angles, hands crossing the face and lighting changes.
Video generation models like Seedance 2.0, Kling 3.0, Veo 3.1 and Wan 2.7 work differently: they create new footage rather than editing faces in a clip you upload.
Consent comes first
Putting a real person's face into footage without permission can amount to impersonation, fraud or harassment, and many platforms restrict it. Only use likenesses you have the rights to, get written consent from anyone who appears, and label synthetic media clearly.
What Flixly offers instead
- Reference to Video: upload a reference image of a subject (a consenting person, a mascot or an original character) and describe the scene. Seedance 2.0, Veo 3.1 and Wan 2.7 support this mode.
- Image to Video: animate a single photo into a short clip with models such as Seedance 2.0, Kling 3.0, Veo 3.1 or Wan 2.7.
- Motion Control: Kling 3.0 Motion Control takes a character image and a reference video and animates the character with the video's movement.
- Lip Sync: upload a video and an audio track to get the video back with mouth movement matched to the audio.
Real workflows
Product teams that want to test different spokespeople can generate the same scene with Reference to Video from each consenting presenter's photo, then run each clip through Lip Sync with the same voiceover.
Animators can record a performance and use Motion Control to transfer it onto an original character. For a longer piece built from several shots, the Long Video Generator keeps the project in one place.
Comparison of supported models
| Model | Durations | Resolutions | Reference to Video | Credit cost |
|---|---|---|---|---|
| Seedance 2.0 | 4-15s | 480p to 4k | Yes | quoted in-app |
| Kling 3.0 | 3-15s | 720p to 4k | No | quoted in-app |
| Veo 3.1 | 4, 6 or 8s | 720p to 4k | Yes | quoted in-app |
| Wan 2.7 | 2-15s | 720p and 1080p | Yes | quoted in-app |
Where to start
Open Reference to Video, upload a clear image of a subject you have rights to, describe the scene, pick Seedance 2.0 and check the credit quote before you generate.
Frequently Asked Questions
Can Flixly replace a face in my existing video?▾
No. A face-swap tool is not part of Flixly. Its video models generate new clips, for example from a reference image with Reference to Video, and Lip Sync can match mouth movement in a video to a new audio track.
How does Lip Sync handle audio?▾
Lip Sync takes your video and an audio track and returns the video with mouth movement matched to that audio. Its cost is quoted once the audio is uploaded, based on the audio length.
What reference photos work best?▾
Use a sharp, well-lit, front-facing image where the face is not covered by hair, hands or sunglasses. Better references generally give more consistent results.
Is there a limit on clip length?▾
It depends on the model. Seedance 2.0, Kling 3.0 and Wan 2.7 go up to 15 seconds per generation, and Veo 3.1 up to 8 seconds. For longer pieces, use the Long Video Generator.
